PID Autotune Problem new hot end
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I think I am doing something wrong, but can not seem to figure it out. I have saved pid strings from previous runs for other hot ends, but trying to do a tune on one that had not been done yet. I have a older hotend and a new one, both give the same results with same warning when I try and run the M307. These are makergear V4 hotends. Seems like the entry never get into the config when it errors out with that warning. Firmware is 3.3
I have done this multiple times with 2 hot ends, letting them cool to RT between runs and same results. Chart is always a sign wave from 193C to 213C for every phase as if it is not making any adjustments as one would expect if it is trying to tune the PW.
This is the console data when I send the line returned after the tune.M307 H1 B0 R2.262 C203.4:136.6 D6.33 S1.00 V24.2
9/27/2022, 3:49:15 PM M307 H1 B0 R2.262 C203.4:136.6 D6.33 S1.00 V24.2
Warning: M307: Heater 1 appears to be over-powered. If left on at full power, its temperature is predicted to reach 485C
9/27/2022, 3:47:59 PM Auto tuning heater 1 completed after 3 idle and 10 tuning cycles in 575 seconds. This heater needs the following M307 command:
M307 H1 B0 R2.262 C203.4:136.6 D6.33 S1.00 V24.2
Send M500 to save this command in config-override.g
9/27/2022, 3:45:02 PM Auto tune starting phase 5, tuning with fan on
9/27/2022, 3:42:26 PM Auto tune starting phase 4, tuning with fan off
9/27/2022, 3:40:03 PM Auto tune starting phase 3, heating system settling
9/27/2022, 3:38:29 PM Auto tune starting phase 1, heater on
9/27/2022, 3:38:24 PM m303 t0 s205
Auto tuning heater 1 using target temperature 205.0°C and PWM 1.00 - do not leave printer unattended -
@airscapes said in PID Autotune Problem new hot end:
M307 H1 B0 R2.262 C203.4:136.6 D6.33 S1.00 V24.2
Not sure why but changed to H1 rather than T0 and it worked..
No error message but still a nice sign wave never a nice solid line.
Set temp to 220 seems to be holding soild.. guess this was just user error.. can Not sure if I can mark this as closed or if you should just remove it. -
What error are you getting?
This?
@airscapes said in PID Autotune Problem new hot end:
Warning: M307: Heater 1 appears to be over-powered. If left on at full power, its temperature is predicted to reach 485C
That's normal.
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@phaedrux Thanks! Seems to work now. What would cause the swing in temp? I mean I would expect that at first and as the thing ran I would think it would be come more stable but it does not.. Not looking for issues that don't exist if this is normal, just curious.
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When tuning it as a tool (T0) it tries to use the part cooling fan so that it can predict how much heat loss there would be and compensate. Perhaps your cooling fan has an unusual impact on the cooling.
Hard to say without seeing the temp graph and the exact error message.
But if it's working well after tuning as a heater (H1) then that's fine, no reason to go further.
